[ENH] remove forecasting from readme

[TonyBagnall]

"Below we provide a quick example of how to use aeon for forecasting, classification and clustering." -> "Below we provide a quick example of how to use aeon for classification and clustering."

[aeon-actions-bot[bot]]

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ].

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